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Spatially resolved charge-transfer kinetics at the quantum dot-microbe interface using fluorescence lifetime imaging

Mokshin Suri1, Farshid Salimi Jazi2, Jack C Crowley3

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Researchers studied charge transfer in microbe-semiconductor biohybrids using quantum dots (QDs) and Shewanella oneidensis. They identified two electron transfer mechanisms, crucial for developing advanced nano-bio hybrid systems for solar energy applications.

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Area of Science:

  • Nanotechnology
  • Biotechnology
  • Photochemistry

Background:

  • Microbe-semiconductor biohybrids integrate quantum dots (QDs) with biological systems for solar-to-chemical conversion and light-modulated biochemical processes.
  • Understanding charge-transfer dynamics at the nano-bio interface is crucial for developing these systems.
  • Microbial and QD heterogeneities complicate mechanistic understanding.

Purpose of the Study:

  • To analyze charge transfer between a CdSe QD film and Shewanella oneidensis microbes.
  • To elucidate fundamental electron transfer mechanisms at complex nano-bio interfaces.
  • To provide design principles for advanced nano-bio hybrids.

Main Methods:

  • Utilized fluorescence lifetime imaging microscopy (FLIM) to study charge transfer.
  • Correlated spatiotemporal fluorescence data with an analytical model.
  • Investigated de-excitation pathways in QD-microbe systems.

Main Results:

  • Identified two distinct QD de-excitation pathway distributions.
  • Observed a faster transfer rate with fewer acceptors (indirect electron transfer).
  • Observed a slower transfer rate with more acceptors (direct electron transfer).

Conclusions:

  • Spectroscopic imaging can reveal fundamental electron transfer mechanisms in complex biohybrid systems.
  • Distinct direct and indirect electron transfer pathways were identified.
  • Findings offer design principles for optimizing nano-bio hybrids for energy and biochemical applications.